Remove unused Debug::AfterCompileFlags flags

src/debug.h

Index: src/debug.h
diff --git a/src/debug.h b/src/debug.h
index b672940c0f9ef58738c3d2dfeb8bfc91267b9526..c389c0120f241aa73ae714f36738637a1d3b90bd 100644
--- a/src/debug.h
+++ b/src/debug.h
@@ -364,17 +364,11 @@ class PromiseOnStack {
 // DebugInfo.
 class Debug {
  public:
-  enum AfterCompileFlags {
-    NO_AFTER_COMPILE_FLAGS,
-    SEND_WHEN_DEBUGGING
-  };
-
   // Debug event triggers.
   void OnDebugBreak(Handle<Object> break_points_hit, bool auto_continue);
   void OnException(Handle<Object> exception, bool uncaught);
   void OnBeforeCompile(Handle<Script> script);
-  void OnAfterCompile(Handle<Script> script,
-                      AfterCompileFlags after_compile_flags);
+  void OnAfterCompile(Handle<Script> script);
   void OnScriptCollected(int id);
 
   // API facing.